info_hesiod.c revision 1.1.1.1.8.1 
1/*	$NetBSD: info_hesiod.c,v 1.1.1.1.8.1 2009/05/13 18:49:02 jym Exp $	*/
2
3/*
4 * Copyright (c) 1997-2009 Erez Zadok
5 * Copyright (c) 1989 Jan-Simon Pendry
6 * Copyright (c) 1989 Imperial College of Science, Technology & Medicine
7 * Copyright (c) 1989 The Regents of the University of California.
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * Jan-Simon Pendry at Imperial College, London.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 * 3. All advertising materials mentioning features or use of this software
22 *    must display the following acknowledgment:
23 *      This product includes software developed by the University of
24 *      California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 *    may be used to endorse or promote products derived from this software
27 *    without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 *
42 * File: am-utils/amd/info_hesiod.c
43 *
44 */
45
46/*
47 * Get info from Hesiod
48 */
49
50#ifdef HAVE_CONFIG_H
51# include <config.h>
52#endif /* HAVE_CONFIG_H */
53#include <am_defs.h>
54#include <amd.h>
55#include <sun_map.h>
56
57#define	HES_PREFIX	"hesiod."
58#define	HES_PREFLEN	7
59
60#ifdef HAVE_HESIOD_INIT
61/* bsdi3 does not define this extern in any header file */
62extern char **hesiod_resolve(void *context, const char *name, const char *type);
63extern int hesiod_init(void **context);
64static voidp hesiod_context;
65#endif /* HAVE_HESIOD_INIT */
66
67/* forward declarations */
68int amu_hesiod_init(mnt_map *m, char *map, time_t *tp);
69int hesiod_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp);
70int hesiod_isup(mnt_map *m, char *map);
71
72/*
73 * No easy way to probe the server - check the map name begins with "hesiod."
74 * Note: this name includes 'amu_' so as to not conflict with libhesiod's
75 * hesiod_init() function.
76 */
77int
78amu_hesiod_init(mnt_map *m, char *map, time_t *tp)
79{
80  dlog("amu_hesiod_init(%s)", map);
81  *tp = 0;
82
83#ifdef HAVE_HESIOD_INIT
84  if (!hesiod_context && hesiod_init(&hesiod_context) != 0)
85    return ENOENT;
86#endif /* HAVE_HESIOD_INIT */
87
88  return NSTREQ(map, HES_PREFIX, HES_PREFLEN) ? 0 : ENOENT;
89}
90
91
92/*
93 * Do a Hesiod nameserver call.
94 * Modify time is ignored by Hesiod - XXX
95 */
96int
97hesiod_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp)
98{
99  char hes_key[MAXPATHLEN];
100  char **rvec;
101#ifndef HAVE_HESIOD_INIT
102  int error;
103#endif /* not HAVE_HESIOD_INIT */
104
105  dlog("hesiod_search(m=%lx, map=%s, key=%s, pval=%lx tp=%lx)",
106       (unsigned long) m, map, key, (unsigned long) pval, (unsigned long) tp);
107
108  if (key[0] == '.')
109    return ENOENT;
110
111  xsnprintf(hes_key, sizeof(hes_key), "%s.%s", key, map + HES_PREFLEN);
112
113  /*
114   * Call the resolver
115   */
116  dlog("Hesiod base is: %s\n", gopt.hesiod_base);
117  dlog("hesiod_search: hes_resolve(%s, %s)", hes_key, gopt.hesiod_base);
118  if (amuDebug(D_INFO))
119    _res.options |= RES_DEBUG;
120
121#ifdef HAVE_HESIOD_INIT
122  /* new style hesiod */
123  rvec = hesiod_resolve(hesiod_context, hes_key, gopt.hesiod_base);
124#else /* not HAVE_HESIOD_INIT */
125  rvec = hes_resolve(hes_key, gopt.hesiod_base);
126#endif /* not HAVE_HESIOD_INIT */
127
128  /*
129   * If a reply was forthcoming then return
130   * it (and free subsequent replies)
131   */
132  if (rvec && *rvec) {
133    if (m->cfm && (m->cfm->cfm_flags & CFM_SUN_MAP_SYNTAX)) {
134      *pval = sun_entry2amd(key, *rvec);
135      XFREE(*rvec);
136    } else
137      *pval = *rvec;
138    while (*++rvec)
139      XFREE(*rvec);
140    return 0;
141  }
142
143#ifdef HAVE_HESIOD_INIT
144  /* new style hesiod */
145  return errno;
146#else /* not HAVE_HESIOD_INIT */
147  /*
148   * Otherwise reflect the hesiod error into a Un*x error
149   */
150  dlog("hesiod_search: Error: %d", hes_error());
151  switch (hes_error()) {
152  case HES_ER_NOTFOUND:
153    error = ENOENT;
154    break;
155  case HES_ER_CONFIG:
156    error = EIO;
157    break;
158  case HES_ER_NET:
159    error = ETIMEDOUT;
160    break;
161  default:
162    error = EINVAL;
163    break;
164  }
165  dlog("hesiod_search: Returning: %d", error);
166  return error;
167#endif /* not HAVE_HESIOD_INIT */
168}
169
170
171/*
172 * Check if Hesiod is up, so we can determine if to clear the map or not.
173 * Test it by querying for /defaults.
174 * Returns: 0 if Hesiod is down, 1 if it is up.
175 */
176int
177hesiod_isup(mnt_map *m, char *map)
178{
179  int error;
180  char *val;
181  time_t mtime;
182  static int last_status = 1;	/* assume up by default */
183
184  error = hesiod_search(m, map, "/defaults", &val, &mtime);
185  dlog("hesiod_isup(%s): %s", map, strerror(error));
186  if (error != 0 && error != ENOENT) {
187    plog(XLOG_ERROR,
188	 "hesiod_isup: error getting `/defaults' entry in map %s: %m", map);
189    last_status = 0;
190    return 0;			/* Hesiod is down */
191  }
192  if (last_status == 0) {	/* if was down before */
193    plog(XLOG_INFO, "hesiod_isup: Hesiod came back up for map %s", map);
194    last_status = 1;
195  }
196  return 1;			/* Hesiod is up */
197}
198